cheapest way to build

[fattony]

I've been toying with the idea of a small extension for a play room (these kids have some toys!)

Initially I was thinking block work and render but I been looking into alternatives, someone mentioned 'Metset' not exactly sure what this is has anyone used it before?

The other option I though was maybe timber framed, but could I get the external rendered?

The 3rd option is maybe a conservatory but having white panels a majority of the way as there would be no need for glass up against next doors lean to, what sort of foundation depth would be required for a dwarf wall for the conservatory option?

With regards to the timber framed idea would I need to do anything underground? Im not sure of the exact depth but there is currently tarmac followed by a few inches of concrete as this is part of the driveway

Edit:

Just a thought this extension will be attached to one external wall of the house which is poured concrete - ex council house which I believe they built like this in the 50's hence why I want it rendered to match as much as possible to the rest of the house

Thanks

 

[freddiemercurystwin]

First off a conservatory does not make a practical playroom for kids as most of the year it will either be too hot or too cold.

If you build an extension you will need foundations however you build it. Typically these can be deep fill concrete foundations around a 1000 deep and about 5-600 wide.

If you truly want the cheapest way to build then SIP's panels are the route to take. They can be rendered no problem. The main advantage being a shorter construction period hence cheaper overall.

A metal frame route could also be cost effective but offers little advantage over conventional timber frame and will cost more.